Get to the heart of a matter, make perfectly clear. For example, The crash brought home the danger of drinking and driving. This term uses home in the figurative sense of “touching someone or something closely.” [Second half of 1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.